uncrewed

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

adj. Not having a crew; crewless: uncrewed missile launch.

from Wiktionary, Creative Commons Attribution/Share-Alike License

adj. Without a crew; unmanned.

Etymologies

un- +‎ crewed (Wiktionary)

Examples

Robotic probes and so-called uncrewed cosmic laboratories have done their work during the shuttle era, delivering a big scientific bang for the buck, compared to experiments done by human space voyagers.